AniMom comes from the words, Anime and Mom (mother).
An AniMom, of course is a mother who's children love anime and manga.
She's an adult that all the other children, teens, and the young adults don't mind being around.
She enjoys anime and manga.
An AniMom takes her children and their friends to Anime Conventions and Anime Events.
An AniMom makes her children all their cosplay outfits / costumes.

My mom is an AniMom, all our anime friends think she is so cool because she loves anime as much as we do.